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Pension and Other Retiree Benefits (Weighted Average Asset Allocation) (Details) - Pension | Dec. 31, 2020 | Dec. 31, 2019
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U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 100.00% | 100.00%
U.S. | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 64.00% | 56.00%
U.S. | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 29.00% | 33.00%
U.S. | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 6.00% | 3.00%
U.S. | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | [1] | 1.00% | 8.00%
International |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 100.00% | 100.00%
International | Equity securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 21.00% | 13.00%
International | Fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 54.00% | 46.00%
International | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations |  | 4.00% | 3.00%
International | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average asset allocations | [1] | 21.00% | 38.00%
[1] | Multi-strategy hedge funds, insurance contracts and cash and cash equivalents for certain of our plans.

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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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